support brotli (#1938)

Author: sullis

Diff for: client/src/main/java/org/asynchttpclient/netty/request/NettyRequestFactory.java

@@ -17,6 +17,7 @@
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
+import io.netty.handler.codec.compression.Brotli;
 import io.netty.handler.codec.http.DefaultFullHttpRequest;
 import io.netty.handler.codec.http.DefaultHttpRequest;
 import io.netty.handler.codec.http.HttpHeaderValues;
@@ -173,13 +174,18 @@ public NettyRequest newNettyRequest(Request request, boolean performConnectReque
             String userDefinedAcceptEncoding = headers.get(ACCEPT_ENCODING);
             if (userDefinedAcceptEncoding != null) {
                 if (config.isEnableAutomaticDecompression()) {
-                    // we don't support Brotli ATM, for automatic decompression.
-                    // For manual decompression by user, any encoding may suite, so leave untouched
-                    headers.set(ACCEPT_ENCODING, filterOutBrotliFromAcceptEncoding(userDefinedAcceptEncoding));
+                    if (!Brotli.isAvailable()) {
+                        // Brotli is not available.
+                        // For manual decompression by user, any encoding may suite, so leave untouched
+                        headers.set(ACCEPT_ENCODING, filterOutBrotliFromAcceptEncoding(userDefinedAcceptEncoding));
+                    }
                 }
             } else if (config.isCompressionEnforced()) {
                 // Add Accept Encoding header if compression is enforced
                 headers.set(ACCEPT_ENCODING, GZIP_DEFLATE);
+                if (Brotli.isAvailable()) {
+                    headers.add(ACCEPT_ENCODING, HttpHeaderValues.BR);
+                }
             }
         }
 

Diff for: client/src/test/java/org/asynchttpclient/netty/NettyTest.java

@@ -2,6 +2,7 @@
 
 import io.netty.channel.epoll.Epoll;
 import io.netty.channel.kqueue.KQueue;
+import io.netty.handler.codec.compression.Brotli;
 import io.netty.incubator.channel.uring.IOUring;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledOnOs;
@@ -27,4 +28,16 @@ public void ioUringIsAvailableOnLinux() {
     public void kqueueIsAvailableOnMac() {
         assertTrue(KQueue.isAvailable());
     }
+
+    @Test
+    @EnabledOnOs(value = OS.LINUX)
+    public void brotliIsAvailableOnLinux() {
+        assertTrue(Brotli.isAvailable());
+    }
+
+    @Test
+    @EnabledOnOs(value = OS.MAC)
+    public void brotliIsAvailableOnMac() {
+        assertTrue(Brotli.isAvailable());
+    }
 }

Diff for: pom.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-  ~    Copyright (c) 2023 AsyncHttpClient Project. All rights reserved.
+  ~    Copyright (c) 2024 AsyncHttpClient Project. All rights reserved.
   ~
   ~    Licensed under the Apache License, Version 2.0 (the "License");
   ~    you may not use this file except in compliance with the License.
@@ -60,6 +60,7 @@
 
         <netty.version>4.1.107.Final</netty.version>
         <netty.iouring>0.0.25.Final</netty.iouring>
+        <brotli4j.version>1.16.0</brotli4j.version>
         <slf4j.version>2.0.12</slf4j.version>
         <activation.version>2.0.1</activation.version>
         <logback.version>1.4.11</logback.version>
@@ -223,6 +224,49 @@
             <optional>true</optional>
         </dependency>
 
+        <dependency>
+            <groupId>com.aayushatharva.brotli4j</groupId>
+            <artifactId>brotli4j</artifactId>
+            <version>${brotli4j.version}</version>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>com.aayushatharva.brotli4j</groupId>
+            <artifactId>native-linux-x86_64</artifactId>
+            <version>${brotli4j.version}</version>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>com.aayushatharva.brotli4j</groupId>
+            <artifactId>native-linux-aarch64</artifactId>
+            <version>${brotli4j.version}</version>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>com.aayushatharva.brotli4j</groupId>
+            <artifactId>native-linux-riscv64</artifactId>
+            <version>${brotli4j.version}</version>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>com.aayushatharva.brotli4j</groupId>
+            <artifactId>native-osx-x86_64</artifactId>
+            <version>${brotli4j.version}</version>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>com.aayushatharva.brotli4j</groupId>
+            <artifactId>native-osx-aarch64</artifactId>
+            <version>${brotli4j.version}</version>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>com.aayushatharva.brotli4j</groupId>
+            <artifactId>native-windows-x86_64</artifactId>
+            <version>${brotli4j.version}</version>
+            <optional>true</optional>
+        </dependency>
+
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>